RIS is a new frontier in wireless communications to improve reliability of the system and it has been widely investigated in theory for the past couple of years [1]}. The key idea behind the invention of RIS was the introduction of tunable meta-surfaces [2]}. In a very recent study, it is reported the RIS systems' prototyping is successful when compared with the conventional phased array systems, RIS systems are ultra-energy efficient and is validated experimentally [3]}. Theoretical propagation and pathloss modeling of RIS are reported in [4]}, experimental support for the theoretical pathloss model for RIS based communications is proven in[5]}. Orthogonal Frequency Division Multiplexing (OFDM) and passive beamforming case for RIS based communications are investigated in [6]}, [7]}.
